LTC4054ES5-4.2#TRPBF - Linear Technology's Standalone Linear Li-Ion Battery Charger

The LTC4054ES5-4.2#TRPBF is a high-quality standalone linear battery charger manufactured by Linear Technology, designed to efficiently charge single-cell lithium-ion batteries. This compact, SOT-23 packaged charger is an ideal solution for portable applications due to its small size and simplicity of use. With its fixed float voltage of 4.2V, it is optimized for charging 4.2V lithium-ion batteries, which are widely used in consumer electronics, medical devices, and personal gadgets.

The LTC4054ES5-4.2#TRPBF offers a streamlined charging process that does not require any external MOSFET, sense resistor, or blocking diode, which makes it a cost-effective and space-saving choice for designers. It incorporates an internal thermal feedback mechanism that regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions. This ensures safe operation and extends the life of the battery.

Featuring a charge current that is programmable up to 800mA with an external resistor, this charger provides flexibility for different battery capacities and charging speeds. The device also includes an automatic recharge feature, which initiates a new charging cycle if the battery voltage falls below an internal threshold, ensuring the battery remains fully charged.

With its built-in safety features, the LTC4054ES5-4.2#TRPBF includes overcharge protection, which prevents damage to the battery by terminating the charge cycle when the battery is fully charged. Additionally, it has a charge current monitor that allows for charge termination and the ability to detect faulty batteries.

Other notable features of this charger include its low dropout voltage, which allows for better charging efficiency, and a C/10 charge termination that provides a signal indicating when the charge current has dropped to one-tenth of the programmed value, signaling the end of the charge cycle.

Overall, the LTC4054ES5-4.2#TRPBF from Linear Technology is a reliable and efficient charging solution for lithium-ion batteries, offering designers a combination of performance, safety, and convenience in a tiny package.